adventofcode/2022/04/part1.js

import * as R from "remeda";

import { readFile } from "../03/part1.js";

export const sample = readFile("2022", "04", "sample");
export const puzzleInput = readFile("2022", "04", "input");

const rangeLength = ([a, b]) => b - a + 1;

const isContainedBy = ([a1, a2], [b1, b2]) => a1 >= b1 && a2 <= b2;

export const solutionPart1 = R.createPipe(
  (text) => text.split("\n"),
  R.filter(R.identity),
  R.map((line) =>
    line.split(",").map((range) => range.split("-").map((x) => parseInt(x)))
  ),
  R.map(R.sortBy((x) => rangeLength(x))),
  R.countBy(([a, b]) => isContainedBy(a, b))
);